function registration ($id) {
    $select=$pdo->prepare("SELECT * FROM users where id='" . $id . "'");
    $select->execute();
    $xarr=$select->fetchall(PDO::FETCH_ASSOC);

    if($xarr) {
        foreach ($xarr as $users) {
            $x=$users['login'];
        }
    }
}
$id=1;
registration($id);